java——基础数据类型——数组操作—— 遍历数组

package jkcs;

public class jblx 
{

    public static void main(String[] args) 
    {
        // TODO Auto-generated method stub
        // TODO Auto-generated method stub
        
        
        int a[][] = new int[][]{{1},{2,3},{4,5,6}};         //初始化一个数组
        
        
        System.out.println("-------------------");
        
        System.out.println(a.length);          //3
        
        System.out.println("-------------------");
        
        System.out.println(a[0].length);             //1
        System.out.println(a[1].length);   //2
        System.out.println(a[2].length);   //3
        
        System.out.println("-------------------");
        
        System.out.println(a[0][0]);
        
        System.out.println(a[1][0]);
        System.out.println(a[1][1]);

        System.out.println(a[2][0]);
        System.out.println(a[2][1]);
        System.out.println(a[2][2]);
        
        System.out.println("-------------------");
        
        
        for ( int k = 0;k<a.length;k++ )
        {
            
            for( int j=0;j<a[k].length;j++ )
            {
                System.out.print(a[k][j]+"--------");
            }
            
        }
        

    }

}

执行结果：

-------------------
3
-------------------
1
2
3
-------------------
1
2
3
4
5
6
-------------------
1--------2--------3--------4--------5--------6--------